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Type: galaxy, dE
Mag: B=9.4, V=?
Size: 18.62′ x 11.48′
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One of the four satellite galaxies of the Andromeda Spiral, NGC 224 (M31) This dwarf elliptical is the second brightest of the four, and a 3" refractor shows it as an oval blob of light some 35' North West of the nucleus of M31. Although Messier was one of the first observers to glimpse this object in 1773, he did not include it in his catalogue. Visually, the galaxy has an angular size of 8.0' by 3.0', and according to Sanford it measures 17'x10'.
Discovered by Caroline Herschel.
Synonyms: H V-018
Observed in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB, mE, 30' long, 12' broad."
Observations with the 72-inch f/8.8 speculum telescope at Birr Castle noted "Oct 16, 1855. vL; mE np by sf; sharp nucleus, for some distance round which, the neb. is bright and then suddenly decreases; there is a bright star np the nucleus; and another involved in sf end; another in preceding border. Nov 2, 1850. Spirality suspected."
In the 5th edition of Webb's Celestial Objects for Common Telescopes it is described as "large faint obal neb. best with low powers; resolved by Bond: a very large field includes it with NGC 221 and NGC 224. Seems to sparkle; much more oval and less spindle-shaped that as drawn by Bond."
Mentioned in: Dekel, A. & Silk, J. (1986) The origin of dwarf galaxies, cold dark matter and biased galaxy formation. Astrophys.J., 303, 39-55.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag galaxy. Their coded description reads LGEBE,EL,BM,M31 NEAR.
This galaxy appears on page 3 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part I. M.N.R.A.S., 35(5), 159.
Schmidt K.-H., Priebe A. & Boller T. (1993) Nearby galaxies. Revised machine-readable version of the catalogue. Astron. Nachr., 314, 371. [1993AN....314..371S]
Other names: "U426,M110". Inclination: (face-on, in degrees) 58 Total photoelectric blue mag 8.92 Total colour index .85 Logarithm of the angular diameter D25 (arcminutes) 2.34 Blue photographic magnitude 8.93 This galaxy is included in a sample of galaxies with velocity less than 500km/s with respect to the centroid of the Local Group. [Nearby Galaxies. Schmidt K.-H., Priebe A., Boller T. (Astron. Nachr. 314, 371 (1993))]
Listed by the Herschel Club, described as "a lovely oval shape with bright nucleus, nebulosity surrounding it noticeable. 8-inch, 70x."
Mullaney writes that it can be glimpsed in a 60mm refractor at 30x on a dark night.
Hartung notes: "It is low for southern observers, but not difficult for small apertures; 30cm shows a fairly bright diffuse luminous haze 3' x 2' with no apparent structure, rising broadly to the centre. The field is sprinkled with stars."
Phil Harrington (1990, Touring the Universe through Binoculars) notes that "although catalogues list it as being slightly brighter than M32, M110 is far more difficult to glimpse due to its low surface brightness . . . to spot M110, larger glasses are a must. Look for a nondescript oval glow to the northwest of M31."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes "8M; 17'x 10' extent; large, amorphous, faint, oblong blob; faintly brighter toward center; companion of, and 35' NW of the core of M-31; a member of the local group along with M-31, M-32, N147 and N185; good supernova prospect; photo @ HAG-3"
6cm - lg w/broad concen, elong ~N-S, 4'x2' with no nuc.
- lgr than M32. diffuse, barely concen. elong NW-SE. two *s 3'-4' S.
7cm - consp lg oval @ 30x. best @ 50x: elong pa165, halo reaches S as far as more distant of the two m10.5-11 *s along SW flank. min axis is 1.5x sep of these two *s. wk even concen, but also a f sub*ar pip stands out as nuc w/averted vis. BS, 25Nov1992, Anderson Mesa.
15cm - velong N-S. 10'x3' in dk sky, diffuse all over.
25cm - best @ 90x, 10'x3'. core distinguishable, 3'x2', but no sharp cen condensation. pa165. BS.
- 9'x3' oval, diffuse, fades smoothly to sky. hardly brtr across center. BS, 14Oct1982, Anderson Mesa.
30cm - lg and broad w/little concen. 5'x2'.5 in pa150. many *s assoc in neb, one in S end. occas f *ing in center. granular. CBL.
See also "Visual Astronomy of the Deep Sky" by Roger N. Clark (1990, Sky Publishing Corporation) page 68.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (95x)
Independently discovered by Carolina and Charles Messier, NGC 205 also known as M110, the NW companion of M31 the great galaxy in Andromeda. This beautiful soft oval covered in haziness, displays a rather bright nucleus (218x). It has a lower surface brightness because its light is spread across a larger area. Haziness around. Cover almost half my field of view
Observing site: Little Tycho Observatory
[0h 40m 24s, 41° 41m 0s] A barely perceptible glow against the brightly glowing background of the light polluted sky. This was the third or forth time I had looked for M 110, and tonight it was finally seen. Swinging the telescope back and forth in RA made the faint glow a bit more apparent.
The Messier objects
The Bennett objects
The Caldwell list
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